Collapsible core.



no, 865,064. PATENTED SEPT. s, 1907.

- w. 0.;STATB. Y GOLLAPSIB'LE GORE.

APPLICATION TILED DBO. 14. 1906.

' *B'e it lmown'that I, W1LL G, STATE, a citizen of the j UNITED STA-me ENT OFFICE WILL 0. STATE, OF AKRON, onronssrenon TO. THE GOODYEAR rrmn AND access COM- a PANY, OF AKRON, 01-110, A CORPORATION or 01-110;

ooLLAr-sIBLn Cass.

To all whom; it miryepncem:

United States, residing at Akron, in the county of Sum mit and Stateof Ohio, have invented new and useful Improvements in Collapsible Cores, of which the following is a specification.

This invention relates to collapsible cores or mandrels for manufacturing pneumatic tires of the double-tube type having inextensible bands'or edges;

pleted tire through the opening existing along its'inner or rim face. i

The object of this invention therefore, is, broadly speaking, to construct a core upon which the tire may be built and which may be easily and successfully re- ,moved after the vulcanization of the tire through the opening existing in its inner face. Y

With the foregoing and other objects in view, the invention consists in the novel construction, combination and arrangement of parts constituting the invention to be hereinafter referred to and illustrated in the accompanying drawings which form a part of this specification in which is shown the preferred embodiment of the invention,but it is to be understood that changes, va riations and modifications can be resorted to which come within the scope of the claims hereunto appended.

In the drawings, in which similar reference numerals indicate like parts in the different figures: Figure l is a side elevation of a core or mandrel embodying my invention; Fig. 2 is a longitudinal, central section of the same; and, Fig 3 is a section on line t of Fig/2.

Cores for the manufacture of outer tubes of doubletube pneumatic tires are constructed 'annularly, as

' shown in Fig. 1, of a suitable metal in a tubular form,

having such an exterior conformation as it is desired to impart to the interior of the finished tire.

In the drawings, the reference numeral 1 indicates a core or mandrel provided on its inner face with projecting edges 2 separated at intervals from each other and at other portions connected together by integrally. it

formed lugs 3. In order to make the core collapsible, it is divided intoa plurality of parts, so that the several portions thereof maybe withdrawn successively through the opening along the inner, central line of the tire. In making mandrels to be used in the manufacture 5 5 of lav ge tires, the core is preferably formed in four parts,

Specification of Letters Patent. Applicationfiled lleoemher14,1906. SerialNaMZBS t.

. Batente d Sept. 3,1907.

but if tire is a comparatively the core or mandrel may consist of. only threeparts. i

by the reference numerals 4, *5, 6 and 7 ,all of which, when united together, constitute an annular member,

the portions 4 and 6. The lines of severance between the portions 5 and 7 and the balance of the core are formed oblique to the radii in such a manner that the outer or peripheral portions of the parts 5 and 7 are smaller than those portions near the center of the core, so that these portions may be withdrawn easily from the balance of the core.

I prefer to cover the abutting portions of the tire with sheets or plates of steel, referred to in the drawings by the reference numeral 8 in order to make their contact smoother and reduce the wear incident to their use. The inner projecting edges 2 of the core are formed with an inclined face 9 and the extreme inner'porenlarged, constituting an annular beading about the inner portion of the core.

securely in position when a tire is being built thereon and during the vulcanizing process, I use two rings 11 identically alike and having channels cut on one of their faces of such a conformation as will engage the inclined face 9 of the core and inclose the beading 10. "These rings are secured in position and clamp the various portions of the tire together firmly by means rings and the inner edges of the core. The openings for the reception of these bolts are preferably placed so as to pass through the lugs 3. v

In using this core or mandrel the parts are placed in the position shown in Fig. 1 and a tire is built thereon of any kind desired by the manufacturer. The tire and core are then placed in a vulcanizing heat until score is effected; the bolts 12 are removed, which permits the removal of the rings 11. The removal ofthe rings 1]. make it possible to draw inwardthe two parts 5 and 7 of the core. As soon as these two parts are removed, the two parts 4 and 6 are easily drawn out'through the longitudinal opening existing in the inner portion of the tire. It will be noted that by forming the parts 5 and 7 with inclined edges where they united with the other portions 4 and 6, the removal of these other sections of the core becomes an o .sy matter, which -m-ight not be true were the lines of union between the various portions of the core radial to the center;

What I claim and desire to secure by'Letters Patent,

rsz-

.1. A device of, the character described comprising a plurality of independent segment shaped members disconnected from and adapted to abut against each other;

tions, referred to by the reference numeral-10, are i In the drawings, the parts of the 'coreare referred to The parts 5 and 7 are preferably made smaller-than In order to hold the various portions of the core of a plurality of bolts l2 which pass through both the said members wheu in abutting engagement forming a collapsible core.-aud means 0vet-lapping the inner portion of said members for maihtaiuing them in ub'utting engagement.

2. A device of the classdescribed comprising a core cdmp'csed of a plurality of parts, which when united will form an annular member, the lines of severance between the several parts being oblique t0 the radii. of said member. said se'veral parts being provided with in\vardl,vprojecllug portionsconstituting an annular beading. am] a pair of rings adapted to clamp said beading between them wherepresence of two subscribing witnesses.

1 vided with inwardlyprojecting edges. which when united together will form an annular beading, a pair pf rings "adapted to r -unp said beading between them and means to clamp-said rings on said beading.-

4. Adevice of the characterdescribed comprising a plurality of independent segment-shaped members disconnected from and adapted to abut against each other, said members when in abutting engagement forming a collapsibie c'ore, and means independent of said members for maintaining them in abutting positions V Iii-testimony whereof I have hereunto set my hand in WILL e. STATE. 

